Which text consists of 195 aphorisms detailing the practice of Raja Yoga?

The text that consists of 195 aphorisms detailing the practice of Raja Yoga is Pantanjali's Yoga Sutras. This collection, attributed to the ancient sage Patanjali, is foundational in the study of yoga and outlines the eight limbs of yoga, known as Ashtanga Yoga. Each aphorism serves as a succinct principle or guideline that encompasses the philosophy, practices, and goals of yoga, specifically focusing on the mental and spiritual aspects of the practice.

In contrast, while the Bhagavad Gita discusses various paths of yoga and is a profound spiritual text, it is not specifically focused on the structured framework of Raja Yoga as found in the Yoga Sutras. The Hathayoga Pradipika deals with physical postures and the practice of Hatha yoga, an element that is more about preparing the body for meditation rather than the comprehensive philosophy of Raja Yoga itself. The Upanishads are ancient Indian texts that delve into spiritual philosophy and metaphysics but do not provide a systematic approach to yoga similar to that found in the Yoga Sutras. Therefore, Pantanjali's Yoga Sutras stands out as the specific text that addresses Raja Yoga through its concise aphoristic style.